PHILADELPHIA (CBS) — The attorney for a former middle school principal in the Rose Tree-Media School District says his client will plead guilty to federal charges of possession of child pornography.

At the time the investigation began, 42-year-old principal Troy Czukoski of Exton was serving as principal of the Springton Lake Middle School.

Today, the US attorney’s office in Philadelphia announced that two flash drives and a total of 48 CDs and DVDs were seized as part of the search warrant executed on his home in October. According to court documents, he possessed more than 150 images of children engaging in sexually explicit conduct.

Czukoski was placed on leave when the investigation began. Today, the Rose Tree-Media School District issued a statement that said in part, “There is no evidence that Dr. Czukoski ever mistreated any of our children. For this we are all relieved and thankful.”

Czukoski’s attorney today said in a statement that Czukoski himself is a survivor of childhood sex abuse, has suffered for many years from the aftereffects, and is now receiving psychiatric treatment.